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# SPDX-License-Identifier: Apache-2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
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import inspect
import typing
from collections.abc import Callable

_T = typing.TypeVar("_T")


class Streaming(typing.Generic[_T]):

    def __init__(self, *, convert: Callable[[typing.Any], _T] = None):
        self.convert = convert

        sig = inspect.signature(self.convert)

        if (sig.return_annotation == inspect.Parameter.empty):
            raise ValueError("convert must have a return annotation")

        self.single_output_type = sig.return_annotation
